Chaya took a random sample of 49 girls in her high school and let them play a memory game. She also took the participants' heights (in cm): Here is computer output on the sample data: Summary statistics Mean StDev SE Mean Variable height 49 160.6 memory 49 43.4 24.4 3.5 y 9.6 1.4 Regression: memory vs. height Predictor Coef SE Coef Constant 55.42 9.16 Height 0.075 0.056 S = 9.53 R-sq = 3.63% Assume that all conditions for inference have been met Which of these is an appropriate test statistic for testing the null hypothesis that the population slope in this setting is 0?